Ansible folder structure and correct path for requirements.yml

[jp1337]

Hi @fiftin!
I have been using semaphoreui for some time now and have been observing the rapid development of the project.
In the course of the project, however, there were several discussions about the correct specification of the requirements.yml in an Ansible repository.
Since commit c76f04a, our playbooks are no longer running because the corresponding roles or collections are missing.

We currently maintain a central requirements.yml in the root folder roles for roles and a central requirements.yml in the root folder collections.

Unfortunately, I could not find an example of how to structure a repository in the Ansible documentation.

I see the idea of improving performance by storing the requirements.yml in the playbook directory. This way semaphoreui doesn't have to install everything in every temporary folder and the playbook can run faster.

My request would be that you describe to us where we should store the requirements.yml and also include this in the documentation.